While shooting, you can cycle through normal, macro, and landscape focus modes with successive pushes on the down direction of the directional pad. You also have the option of using Single AF or Continuous AF. When set on Single AF, the camera achieves focus lock when you partially depress the shutter release. During Continuous AF, the camera always stays in focus. As you can imagine, Continuous mode will drain your battery a lot faster.



Link: DigitalCameraReview